Stenciling printing press



1937- F. s. BLACKWELL ET AL 2,071,726

STENCILING PRINTING PRESS Filed Oct. 21, 1935 3 Sheets-Sheet 1 as WM Feb. 23, 1937. F. s. BLACKWELL ET AL 2,071,725

STENCILING PRINTING PRESS Filed Oct. 21, .1955 3 Sheets-Sheet 2 Sam/mu;

1937- F. s. BLACKWELL ET AL 2,071,726

STENCILING PRINTING PRESS Filed Oct. 21, 1955 3 Sheets-Sheet 5 F! Nu: new

Patented Feb. 23, 1937 STENCILING PRINTING PRESS Frederick S. Blackwell and John 1. White, Kellogg, Idaho, assignors of one-third to Clarence C. Dunkle, Kellogg, Idaho Application October 21, 1935, Serial No. 45,841 4 g i 1 Claim.

This invention relates to' a printing press of the stenciling type and one object of the invention is to provide a stenciling press of such construction that it will print upon both sides of a strip of paper unwound from a large roll rotatably supported at one end of the press, this having been found impossible with presses of present day construction.

Another object of the invention is to provide an improved stenciling roller of such construction that the cover will be held in its proper position about the roller and may be tightened.

Another object of the invention is to so form the stenciling rollers that the paper can have each face printed to provide two pages of an advertising circular or the like and thus provide a printed sheet which when folded will form a circular of four pages.

Another object of the invention is the provision of improved rollers for feeding the paper through the press and cutting printed sections from the strip of paper.

Another object of, the invention is to provide means whereby air will be allowed to escape as ink is fed into the stencil roller thus preventing too much air being confined in the roller and causing excessive pressure which would expel too much ink through the cloth when the air is expanded by heat transmitted from the heated paper passing under the roller. 7

Another object of the invention is to provide a printing press wherein the various rollers will be driven from a single motor and in such timed relation to each other thatthe strip of paper will beproperly fed to the various printing rollers and cutting rollers and result in an advertising folder or the like printed upon both faces and having the printed matter so arranged upon the sheet that the sheet when folded longitudinally midway its width will form a folder having four pages.

. The invention is illustrated in the accompanying drawings, wherein:

Fig. 1. is a side elevation of the improved printing press.

Fig. 2 is a top plan view thereof.

Fig. 3 is a diagrammatic view illustrating the path followed by the strip of paper through the press; r

Fig. 4 is an enlarged fragmentary sectional View taken longitudinally through one end portion of a stencil roller constituting an element of thepress. v

- Fig. 5 is a fragmentary sectional view taken transversely throughgthe roller and showing the means for securing the cloth and stencil sheet about the roller. Fig. 6 is an enlarged view of Figure 5, the dotted lines illustrating the position of the stencil securing means when moved to a releasing position.

Fig. 7 is a topplan View of the portion of the roller shown in Figure 6.

Fig. 8 is a view looking at one end of Figure '7.

Fig. 9 is a fragmentary sectional view upon an enlarged scale of the paper cutting rollers.

This improved printing press has a frame I formed of metal and having corner posts 2 and 3 and side bars 4, 5, 6, and 1 carried thereby and spaced from each other one above another. A large roll of paper 8 extends horizontally between the corner posts 2 at the front end of the frame, and the supporting shaft 9 for this roll is rotatably supported in bearing brackets I pivoted to the posts 2, as shown at H, and each having an arm or lever I2 carrying an inwardly extending pin l3 at its free end. The metal from which the brackets are formed is of suflicient resiliency to permit the arms to be sprung away from the bars I and, therefore, the pins may be engaged in openings formed in these bars and the brackets held in an elevated position to maintain the roll of paper out of contact with the floor so that it can turn freely. ,The roll of paper ,fits tightly about the shaft 9 so that they turn together and in order to prevent the roll from continuing rotation in an unwinding direction when the press is shut off there has been provided a brake drum l4 fixed to one end of the shaft 9 and engaged by a cooperating band or equivalent friction member carried by a bracket 15 secured to the adjacent post 2. Therefore, the paper can freely unroll when the press is in operation but turning of the roll will cease immediately upon shutting off the press and tearing or soiling of the paper will be prevented.

As the paper leaves the roll it passes about a guide roller I6 mounted in bearings carried by the posts 2 and then extends rearwardly of the frame and about a drying roller I1 rotatably mounted between the posts 3 at the rear end of the frame. After passing upwardly about the roller I'I the paper is carried forwardly to engage about a guide roller I8 rotatably mounted between the side bars after which it is again extended rearwardly of the frame and engaged about a second drying roller 19 mounted between the posts 3 above the roller H. The paper then extends forwardly to the front end of the frame and in doing so'passes between the feed rollers 20 and 2| and the cutter rollers 22 and 23. The feed rollers and cutter rollers are constructed and mounted in a special manner which will be hereinafter fully explained.

Stencil rollers or cylinders 24 and 25 extend transversely across the frame, the roller 24 being disposed between the rollers I6 and I1 and mounted in bearings 26 carried by upright bars 21 at sides of'the frame and the roller 25 being mounted in bearings 28 carried by rear end portions of the side bars 4. Each stencil roller has a presser roller 29 cooperating therewith and rotatably mounted under the companion stencil roller in bearings 30 extending upwardly from ends of brackets 3| extending longitudinally of the frame at opposite sides thereof and pivoted to cars carried by and extending upwardly from the side bars 5 and 6. Each bracket 3| carries a side flange 32 through which extends a bolt 33 carried by the side bar of the frame and having a head at its upper end as shown in Figure 3, and referring to this figure it will be seen that each bolt carries a spring 34 having its upper .end bearing against the flange of the bracket and at its lower end resting upon a nut 35 threaded upon the bolt and carrying handles 36. By grasping the handles the nut can be easily rotated and shifted along the bolt to regulate tension of the spring and cause the pressure roller to apply the desired pressure to the portion of the paper passing between it and the companion stencil roller.

Rotary motion is to be transmitted to the rollers 24'and 25 and in order to do so there has been provided a sprocket chain 31 engaged about sprocket wheels 38 and 39 carried by the rollers and also engaged about an idler sprocket 40 carried by the side bar 4 at one side of the frame. This chain 31 has a portion extending downwardly from the sprockets 38 and 40 and engaged about a sprocket 4| carried by a driveshaft 42 extending transversely across the frame and mounted in bearings 43 carried by the bars 21. A large pulley 44 is fixed upon the drive shaft within the frame and about this pulley engages a belt 45 which also engages about a pulley 43 carried by the shaft of an electric motor 41 mounted upon a platform 48 supported between rear end portions of the side bars I of the frame. The switch 49 controls operation of the motor and also operation of a heater 5!] carried by rear portions of the side bars 6 and through which the paper passes as it moves from the stencil roller 24 to the drying roller l1. Another heater 5i is mounted between front portions of the side bars 6 and controlled by a switch 52 mounted upon one of these side bars. It will thus be seen that the heater will be turned on and off with the motor but the heater 5| is independently controlled. These heaters serve to heat the paper before and after passing between the stencil roller 24 and its cooperating pressure roller and each consists of heating coils 53 enclosed in housings 54 having large closure plates 55 between which the paper passes as shown in Figure 3. The closure plates project from opposite sides of the housings and serve very effectively to distribute the heat of the coils over a large area and thus cause the paper to be thoroughly heated as it passes between the face plates. By so heating the paper the ink will be quickly absorbed and to some extent immediately dried and thus prevented from spreading and forming a smeary looking advertising folder. The rollers l7 and I9 are drying rollers Which carry blotting paper shown at 56 and as the paper passes about these rollers before reaching the stencil roller or cylinder 25 matter printed upon the paper by the roller 24 will be thoroughly dried, before passing between the roller 25 and its companion pressure roller and there will be no danger of smearing the circular.

Each of the stencil rollers is constructed as shown in Figure 4 and referring to this figure it will be seen that the roller consists of a cylindrical body 5! having heads 58 at its ends secured by rods 58 and each carrying an annular flange 59 fitting snugly within the body. A trough 60 of strong metal extends longitudinally of the roller between the heads 58 and is formed with side flanges Bl upon which are secured marginal portions of the perforated sheet of metal from which the body 51 of the roller or cylinder is formed, as shown in Figure 6. A partition 62 mounted midway the length of the body divides the same to provide separate end compartments, each of which has an inlet 63 formed by the tubular stub shaft 64, carried by the head 58 closing the outer end of the compartment. These stub shafts are mounted in the bearings 25 and within each inlet is mounted a valve seat 55 of the spider type for engagement by an inwardly opening valve 66, the tubular Stem of which extends through and beyond the outer end of the stub shaft. This stem constitutes an inlet for ink which is forced through the stem when the cap 61 at the outer end of the stem is removed. The valve is to confine air in the cylinder and is yieldably held in a closed posi tion by a spring 68 coiled about the stem with its inner end bearing against the valve seat and its outer end abutting the hood 69 which is secured upon the stem in surrounding relation to the outer end portion of the spring. By this arrangement air can be confined within the chambers and when heated by contact of the roller with the warm paper the air will expand and cause ink in the chambers to be forced out- Wardly through the perforations in the cylindrical body. If the pressure becomes excessive and causes too much ink to be expelled, the hood may be grasped and the stem forced inwardly to move the valve oif the seat and allow air to escape. Upon release of the hood, the spring will return the valve to a closed position.

A cloth 10, against which rests a stencil sheet II, extends about the cylindrical body in operative relation to each chamber with their marginal portions extendinginto the trough 60 and ends of the cloth are formed with hems 12* through which extend anchoring bars 13 and 14. These bars extend longitudinally in the trough with their outer ends mounted in the heads. 58 and their inner ends in the portion of the partition crossing the trough and by referring to Figures '7 and 8 it will be seen that the bars 14 have "squared extensions 14' at their outer ends which project externally of the heads and carry rachets 15 engaged by pawls 16 having actuating springs I1. By this arrangement the bars 14 can be turned so that their spurs 18 will exert pull upon the cloth and tighten the cloths about the cylindrical body of the roller and the pawls will prevent turning of the bars in a direction to loosen the cloths. The end portions of the stencil sheets which extend into the trough are engaged by yokes 19 each of which consists of a roller 80 mounted between outer ends of arms or" links 8| pivoted to the partition and heads by pins 82. The links are of such length that when the yokes are swung downwardly into the trough the rollers have tight binding engagement with the stencil sheets and hold them tightly in place about the cloths. Therefore, ink forced through the cloths will pass through perforations cut in the stencil sheets and printed matter will appear upon the paper. The stencil roller 24 prints upon one face of the paper and this printed matter is then dried by the blotting sheets of the drying rollers after which the paper passes between the roller 25 and its companion pressure roller 29 and printed matter will appear upon the other face of the paper opposite the matter printed thereon by the roller 24. As the ink deposited upon the paper through perforations of the stencil sheet carried by the roller 24 is dried by'heat of the paper and also by the blotting sheets carried by the drying rollers, there will be no danger of it smearing as the paper passes between the roller 25 and its companion roller 29.

Upon leaving the roller 25 the paper passes between the feed rollers 20 and 2! and then between the cutter rollers 22 and 23. These rollers are mounted upon shafts 83, 84, and 86, the shafts 83 and 86 being mounted in bearings 8'! carried by the side bar d and the shafts 85 and 86 being mounted in bearings 88 carried by end portions of a bracket 89 secured upon the side bar 5. This bracket is formed of resilient material and at its ends carries depending pins 90 having heads at their lower ends which extend through openings formed in the supporting bar and are engaged by cams 9i fixed to shafts 92. These shafts are rotatably mounted transversely of the frame and at one end each carries a handle 93 by means of which the shaft may be rotated to raise or lower the cams. Therefore, the portions of the brackets carrying the bearings can be shifted vertically to move the rollers 2| and 23 towards or away from the rollers 21! and 2| and grip upon the paper can be controlled. The rollers 22 and 23 are recessed, as shown in Figures 3 and 9, to form pockets or seats 94 and 95 to receive bars 96 and $31, the bar 96 having a cutting blade 98 mounted therein and the bar 91 being formed with a longitudinally extending groove 99 into which the blade fits, as shown in Figure 9. Therefore, the paper will be cut transversely as it passes between the cutting rollers and the out sections pass onto the tray I00 mounted at the front end of the frame.

Rotary motion is transmitted to the feed rollers and cutting rollers from the shaft 42 by a sprocket chain IUI which engages sprocket wheels I02 and I03 carried by the shaft 42 and the shafts of the rollers, and upon referring to Figure 1 it will be seen that this chain also engages an idler sprocket wheel I04 mounted at the front of the frame and holding the chain in engagement with the sprocket wheel of the shaft carrying the rollers 23. The shaft of the roller 22 also carries a sprocket wheel "15 engaged by a sprocket chain I06 which also engages a sprocket wheel Hi1 carried by a shaft 18 extending across the front end of the frame and rotatably mounted in bearings at sides of the frame. This shaft carries a curved kicker I09 which operates over the shelf H 0 and engages the cut sections of paper and delivers them to the tray. It will thus be seen that the printed circulars will be cut from the strip of paper and delivered one at a time in stacked formation upon the tray. As the stencil rollers each print from two stencils spaced from each other, a circular or advertising sheet will be printed which can be folded intermediate its width and form a circular having four pages. We have, therefore, produced a printing press of the stencil type which is simple in construction, eflicient in operation and selfcontrolled once it has been set in operation.

Having thus described the invention, what is claimed as new is:

A stenciling roller comprising a cylindrical body of perforated material, heads for said body each having a hollow shaft projecting outwardly therefrom, means for securing a cloth and stencil sheet about the hollow body, a valve seat in said shaft, a valve disk to seat about the valve seat movable inwardly to an open position, a hollow stem extending from the disk through said shaft and constituting an inlet for ink, a removable closure for the outer end of the stem, a hood carried by the outer portion of said stem, and a spring about the stem bearing against the hood and yieldably holding the valve disk closed to retain air under pressure in the body.

FREDERICK S. BLACKWELL. JOHN I. WHITE. 

